Resources Contact Us Home
Frost-resistant year-round heat pump

Image Number 2 for United States Patent #4596123.

This invention is an improved refrigerant-cycle heat pump that requires neither a defrosting means nor a backup heat source. From widely varying outside environments, it pumps heat to heat living spaces or domestic hot water. Liquid refrigerant flows from a receiver through expansion valves into an outside evaporator consisting of a segmented array of plates where heat is absorbed from the atmosphere to evaporate the refrigerant. The resultant gas is compressed by a motor-driven compressor, gives up heat in a condenser, becomes liquid, and returns to the receiver. The segmented evaporator enables the self-governing heat pump system to choose the proper magnitude of evaporator area, in response to its determination of compressor suction pressure or motor power demand, so as to provide a steady refrigerant flow to the compressor and thereby maintain optimum heat pumping despite extreme excursions of outside temperature. The configuration of evaporator segments as plates enables the system to operate without interruption or performance deterioration even though frost or ice forms on plate surfaces.

  Recently Added Patents
Semiconductor device having a first conductive member connecting a chip to a wiring board pad and a second conductive member connecting the wiring board pad to a land on an insulator covering
Control of an electric machine
Self-correcting amplifier system
Key management policies for cryptographic keys
Decentralized processing network
Synchronization processing circuit and synchronization processing method in wireless communication system
Mechanical and moisture protection apparatus for electronic devices
  Randomly Featured Patents
Table saw
Method and arrangement for controlling an internal combustion engine
Bis-amino acid hydroxyethylamino sulfonamide retroviral protease inhibitors
Carrier wave detecting tire pressure detecting apparatus and operating method for the same
Humidity sensor of capacitance change type
Flame retardant porous plastics
Novelty hairpiece
Methods for identification of novel protein drug targets and biomarkers utilizing functional networks
Two stage rocket combustor
Black-and-white organic solvent-based photothermographic materials containing mercaptotriazole toners